Havent you played a game where new content comes out and it with it comes the time when everyone has to replace their epic raid gear with greens and blues? Im referring to WoW here, but it is just part of a game like this. New patch, new content, and new gear means its time to keep grinding and farming for that new purple stuff. But you will likely keep your current vault gear for a while, considering you would need to be very lucky to get a whole new set of gear in a short amount of time.